I have 36,134,588 trained levels (so total levels after subtracting a bunch of 20's) and an MPR of 6,091,788. Go to town :)
Let's see
36,134,588 X 12 = 433615056 XP
plugging 6,091,788MPR into the formula yields: 433668650 XP
Accuracy = 99.99% (or thereabouts)
Yeah, I'd say it is still valid.